Hello,
 
I am relatively new to this discussion, and I am interested to know
your thoughts on the following.
 
The Microsoft Windows Time Zone User Interface allows you to
use (with a check box) daylight savings in all time zones where 
applicable.
 
I was wondering as to why they made that a user modifiable option? 
They could for example have had two Eastern Standard Time (EST)
pulled down options, one using daylight savings, and the other not
using daylight savings (for same parts of Indiana).
 
Is it for flexibility? or .....?
 
Thank you.
 
Srini